F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

583
Ste
p
Command Remarks
735. Configure an IGMP SSM
mapping.
ssm-mapping group-address { mask |
mask-length } source-address
No IGMP mappings are
configured by default.
755BConfiguring IGMP proxying
This section describes how to configure IGMP proxying.
1597BConfiguration prerequisites
Before you configure the IGMP proxying feature, complete the following tasks:
• Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer.
• Enable IP multicast routing.
1598BEnabling IGMP proxying
You can enable IGMP proxying on the interface in the direction toward the root of the multicast
forwarding tree to make the device serve as an IGMP proxy.
When you enable IGMP proxying, follow these guidelines:
• Each device can have only one interface serving as the proxy interface.
• You cannot enable IGMP on an interface with IGMP proxying enabled. Moreover, only the igmp
require-router-alert, igmp send-router-alert, and igmp version commands can take effect on such
an interface.
• You cannot enable other multicast routing protocols (such as PIM-DM or PIM-SM) on an interface
with IGMP proxying enabled, or vice versa. However, the source-lifetime, source-policy, and
ssm-policy commands configured in PIM view can still take effect. In addition, in IGMPv1, the
designated router (DR) is elected by the working multicast routing protocol (such as PIM) to serve as
the IGMP querier. Therefore, a downstream interface running IGMPv1 cannot be elected as the DR
and thus cannot serve as the IGMP querier.
To enable IGMP proxying:
Ste
p
Command Remarks
736. Enter system view. system-view N/A
737. Enter interface view.
interface interface-type interface-number
N/A
738. Enable the IGMP
proxying feature.
igmp proxying enable Disabled by default.
1599BConfiguring multicast forwarding on a downstream interface
Typically, to avoid duplicate multicast flows, only queriers can forward multicast traffic. On IGMP proxy
devices, a downstream interface must be a querier in order to forward multicast traffic to downstream
hosts. If the interface has failed in the querier election, you must manually enable multicast forwarding on
this interface.
On a multi-access network with more than one IGMP proxy device, you cannot enable multicast
forwarding on any other non-querier downstream interface after one of the downstream interfaces of
these IGMP proxy devices has been elected as the querier. Otherwise, duplicate multicast flows might be
received on the multi-access network.